Farmageddon on 09 June 2010
I go with 3.
Yoshi is a great power up, sure, but I think all the other unique power ups 3 had kind of make up for that. The thing that really makes this hard is your ability to re-play levels. But SMB 3 nailed the physics for the first time and introduced most of the ideas that became basic for 2D Marios. And Giant world was awesome. Oh, there was a movie for it too.
